P1423
Secondary Air Injection System Bank 1 Insufficient Flow Detected
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Check Engine Light Is On
- Increased level of harmful emissions
- Unstable engine operation at idle
- Reduced engine power
- Noise from the secondary air system
Causes
- Clogged air channels of the system
- Secondary air valve malfunction
- Air pump problems
- Open or short circuit in control circuit
- Sensor or control unit malfunction
How to Fix
- Check the condition of air channels and filters
- Test the operation of the secondary air valve
- Check the serviceability of the air pump
- Diagnose control circuit and sensors
- Clean or replace faulty components